A battery-receiving structure of a wireless mouse has a front section structure belonging to a front part and a receiving structure belonging to a rear part. The receiving structure has a first latching part, a second latching part, a seat body with multiple battery holes and an upper cover covering the seat body. A first latching body and a second latching body are set inside the upper cover corresponding to the first latching part and the second latching part. Meanwhile, the first latching body and the second latching body are latched to the first latching part and the second latching part. An existent upper cover is used as a battery cover; therefore, the battery cover does not need not to be molded additionally and the cost is lowered. In addition, the space inside the mouse is also fully used.